回答編集履歴
1
もっと上手くできるかも
test
CHANGED
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@@ -41,3 +41,133 @@
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```
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JavaScriptのタイミングは適当に変えてください。
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### 追記
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比較演算子の調整が必要かも
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```HTML
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<body>
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<div class="container area bg-light" id=hoge>
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<div id=messages>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">hoge</div>
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<div class="message">これをbottom: 0の位置にくるようにしたい</div>
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</div>
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</div>
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</body>
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```
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```CSS
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.area {
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height: 50vh;
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overflow-y: scroll
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}
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```
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```JavaScript
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window.onload = function() {
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var aH = window.innerHeight / 2;
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var mH = $('#messages').outerHeight();
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if (mH<aH) {
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var offset = $('#messages').offset({top:aH-mH});
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} else {
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$('#hoge').animate({scrollTop: $('#hoge')[0].scrollHeight}, 'fast');
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}
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}
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```
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両方要jQuery
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思いつき等々で書いたのでもっといい書き方あるかもしれません。
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